In which book does Dumbledore respond to Harry’s question concerning reality by saying, "Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?"
Answer Harry Potter and the Deathly Hallows
In Harry Potter and the Deathly Hallows this thoughtful conversation is spurred by Harry asking “Tell me one last thing, is this real? Or has this been happening inside my head?"
Asked by Rachel Bortles · Last updated 5 years ago · 8.2K views · SOURCE